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Income Taxes - Schedule of Tax Effects of Temporary Differences Which Give Rise to Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Medical claims liability $ 178 $ 217
Nondeductible liabilities 81 111
Net operating loss and tax credit carryforwards 70 71
Compensation accruals 93 113
Premium and trade receivables 72 94
Operating lease liability 231 269
Unrealized gain/loss 153 179
Software development costs 246 193
Other 92 92
Deferred tax assets 1,216 1,339
Valuation allowance (77) (82)
Net deferred tax assets 1,139 1,257
Deferred tax liabilities:    
Goodwill and intangible assets 1,518 1,603
Fixed assets 135 127
Right-of-use asset 88 98
Other 82 70
Deferred tax liabilities 1,823 1,898
Net deferred tax liabilities $ (684) $ (641)